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1.
S. M. Arabei 《Journal of Applied Spectroscopy》1998,65(4):560-566
Monochromatic photoexcitation and selective registration in bands of purely electronic S1↔S0 transitions resulted in fine fluorescence and absorption (fluorescence excitation) spectra of hypericin in polyvinylbutyral
at a temperature of 4.2 K. Vibration analysis of the spectra is done and conclusions are made about the form of many normal
vibrations. It is found that the formation of intramolecular hydrogen bonds in the hypericin structure has a substantial effect
on the relative position of the electronic vibrational levels of the pigment molecule.
Institute of Molecular and Atomic Physics of the National Academy of Sciences of Belarus, 70, F. Skorina ave., Minsk 200072,
Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 4, pp. 539–545, July–August, 1998. 相似文献
2.
G. A. Zalesskaya 《Journal of Applied Spectroscopy》1998,65(5):701-721
Results of investigations of the process of multiphoton excitation of polyatomic molecules by CO2-laser radiation are presented. The mechanism of formation of the profiles of IR absorption bands of polyatomic molecules
is discussed. New experimental methods of investigation of relaxation processes at high levels of vibrational excitation of
molecules in the ground and triplet states are considered. For vapors of polyatomic molecules and their mixtures with foreign
gases, the quantitative characteristics of the collisional exchange and the vibrational-energy transfer as well as the rates
of intercombinational conversion ⇛ and triplet-triplet transfer are presented and their dependences on the vibrational-excitation
level are discussed.
Institute of Molecular and Atomic Physics of the National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072,
Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 5, pp. 675–693, September–October, 1998. 相似文献
3.
From the independence of the contour of spectral density of the rotational (orientation) correlation function of a rigid molecular
top of arbitrary symmetry on temperature in the frequency scale based on the reduced time of rotational orientation relaxation
and from the near independence of the rotational contour of vibrational and vibronic absorption bands of dipole transitions
in the same coordinates in a model of “regular diffusion” of the transition oscillator with a classically rotating rigid molecular
top, it is suggested that it is possible to use the halfwidth of the contour for estimation of temperatures. Data are presented
on the halfwidth of 48 contours of bands of A, B, and C types at this frequency for 12 compounds for a temperature range of
from units to 500 degrees of absolute temperature measured experimentally and (for low temperatures) calculated by the quantum
theory.
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 3, pp. 312–317, May–June, 1997. 相似文献
4.
A. P. Zazhogin 《Journal of Applied Spectroscopy》1999,66(3):455-457
On the basis of analysis of relationships relating, among themselves, the positions of bands in the spectra of electron and
IR absorption of uranyl complexes in solutions and the donor ability of neutral ligands, the possibility is shown for fine-tuning
frequencies of absorption of complexes to frequencies of argon- and CO2-laser generation lines and using them in the development of methods of control over chemical reactions involving actinides.
Belarusian State University, 4, F. Skorina Ave., Minsk, 220050, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 66, No. 3, pp. 420–422, May–June, 1999. 相似文献
5.
A calculation of the frequencies and forms of the normal vibrations of the 31-atom molecule 2,3-di-O-nitromethyl-β-D-glucopyranoside
has been performed. Particular emphasis has been placed on the interpretation of the strongest bands in the spectrum of 2,3-di-O-nitro-methyl-β-D-glucopyranoside,
which are due to vibrations of the nitrate groups.
The present work has been reported at the IV International Congress of theoretically competent chemists, Jerusalem (Israel),
July 7–12, 1996.
B. I. Stepanov Institute of Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 6, pp. 724–728, November–December, 1997. 相似文献
6.
S. A. Mikhnov 《Journal of Applied Spectroscopy》1999,66(6):994-998
It has been found that the F-band of optical absorption which is observed in ψ-irradiated NaF crystals consists of three overlapping
bands. The band at 345 nm of width 40 nm is independent of the impurity composition of the crystals; it disappears upon exposure
to radiation at 345 nm and appears again upon annealing at 460±15 K for 15 min. This band is correlatable in intensity with
the superfine structure of an EPR spectrum. The width (65–110 nm) and the spectral position (355–375 nm) of the second band
depend on the impurity composition of the crystal. The band of width 90–110 nm at 320–325 nm disappears upon annealing and
appears after exposure to light simultaneously with the disappearance of an EPR signal. It is established that the band at
345 nm is caused by quasimolecules based on fluorine atoms, that at 355–375 nm is triggered by F-centers with a different
impurity composition near the haloid vacancy, and the band at 320–325 nm owes its appearance to F-centers in a negatively
charged state (F′).
Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 6, pp. 849–853, November–December, 1999. 相似文献
7.
Poly(vinyl acetate), poly(vinylidene fluoride–hexafluoropropylene), lithium perchlorate salt, and the different plasticizer-based
gel polymer electrolytes were prepared by solvent-casting technique. The structural and the complex formation have been confirmed
by X-ray diffraction spectroscopic analysis. Thermal stability of the different plasticizer-added electrolyte films has been
analyzed by means of thermogravimetric analysis. Ionic conductivity of the electrolyte samples has been found as a function
of temperature and the plasticizers. Among the various plasticizers, ethylene carbonate-based complexes exhibit maximum ionic
conductivity value of the order of 10−4 Scm−1. Finally, the microstructure of the maximum ionic conductivity sample has been depicted with the help of scanning electron
microscope analysis. 相似文献
8.
Kh. Sh. Abdulov 《Journal of Applied Spectroscopy》2005,72(6):796-803
Using cis-1,4-polyisoprene as an example, the influence of the conformation and orientation of the polymer chain on its polarization
absorption spectra has been simulated. It has been shown that if a change in the orientation of the polymer chain leads to
a monotonic change in the intensities of the absorption bands with their maxima positions remaining unchanged, then changes
in the polymer chain conformation additionally cause a shift and the appearance of new absorption bands. According to the
results of the calculation of the vibrational spectra, the inversion of the IR dichroism of the absorption bands of polymers
is associated with the conformation transition.
We simulate the influence on the IR absorption spectrum of the degree of crystallinity of cis-1,4-polyisoprene, in which the
amorphous and amorphous-crystalline states are considered as a mixture of noninteracting polymer chains, where each state
is characterized by a certain ratio of conformers. Likewise, the changes in the IR absorption spectrum of cis-1,4-polyisoprene
under its stretching have been investigated.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 6, pp. 727–733, November–December, 2005. 相似文献
9.
We show that when polystyrene is exposed (for 15–60 sec) to a UV laser light beam (λ = 248 nm), its absorption and luminescent
properties change significantly. In the irradiated polymer, optical centers are formed with absorption bands in the 280–460
nm region and fluorescence bands in the 330–520 nm region. We have established the chemical structure of the optical centers
for fluorescence of polystyrene.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 1, pp. 54–58, January–February, 2006. 相似文献
10.
N. M. Shishlov Sh. S. Akhmetzyanov S. L. Khursan 《Russian Journal of Physical Chemistry B, Focus on Physics》2010,4(5):846-859
IR spectroscopy measurements show that films of poly(diphenyl sulfophthalide) (PDSP), a cardo polymer, interact with atmospheric
moisture during storage at room conditions. A total of 15 absorption bands were isolated in spectra of PDSP hydrated during
storage, which belong to sorbed water and hydrolysis products. A number of absorption bands (within 1500–1800 cm−1 and 980–1100 cm−1) were obtained by subtracting the spectrum of the film after heating from that of the initial hydrated film. At least six
individual bands in the region of the O-H bond stretching vibration were isolated by decomposing a broad complex band (3700–2000
cm−1) into Gaussian components. The isolated bands were tentatively assigned based on the available literature data and quantum-chemical
calculations of the characteristics of a number of complexes of a diphenyl sulfophthalide model compound with water molecules.
The IR spectra and energies of the hydrogen bonds formed were calculated at the B3LYP/6-311G(d, p) level. In particular, the absorption bands at 1010 and 1079 cm−1 were assigned to the symmetric stretching vibrations of the S=O bonds in the −SO3− anion, the 1062-cm−1 absorption band, to ν(C-OH), and the absorption bands at 3646, 3586, and 3475 cm−1, to complexes of water with sulfophthalide cycles of the polymer. After a long storage, PDSP largely transforms into a polymeric
oxonium salt, and its spectrum becomes similar to that of a polymeric salt prepared by alkaline hydrolysis. A general mechanism
of the interaction of PDSP with water is proposed, according to which the hydrolysis of the sulfophthalide cycles (SPC) by
sorbed water yields new hydrophilic groups, sulfoacid, and hydroxyl groups. A further sorption of water by the sulfoacid results
in its ionization and the formation of various hydroxonium forms. Sorption and hydrolysis are reversible processes: water
is desorbed and the SPC is recovered when the polymer is heated to 100–150°C, as can be judged from an increase in the intensity
of the S=O bond vibrations of the sulfophthalide cycle at 1352 and 1192 cm−1. The possibility of using strongly hydrated PDSP for manufacturing proton-conducting membranes is discussed. 相似文献
11.
A procedure for producing 9,10-diiodoanthracene that is an alternative to the known procedure is described. The spectra of
absorption and fluorescence in hexane, carbon tetrachloride, and polymethylmethacrylate are measured at 22°C. The quantum
yield of undegassed liquid solutions in hexane and carbon tetrachloride in excitation at the maximum of the 0←0 band is practically
the same and is equal to 0.018. In excitation in shorter-wave vibrational bands, it is different for different solvents and
decreases noticeably as the frequency of the exciting light increases. The decrease in the yields is explained by the existence
of a fast nonradiative process from hot (Franck-Condon) vibrational S1-states capable of competing with vibrational relaxation. A possible scenario of this approach is discussed.
Institute of Molecular Physics, National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 2, pp. 197–200, March–April, 1999. 相似文献
12.
The IR spectrum of 4-O-methyl-2,3,6-tri-O-nitromethyl-β-D-glucopyranoside has been interpreted in detail for the first time
based on complete calculation of the normal vibration frequencies and absolute intensities of its IR absorption bands and
a comparison of them with the corresponding experimental data. The results indicate that the location of the nitrates in cellulose
nitrates can be determined experimentally from separate components of complicated absorption bands in the ranges 1700–1600
and 900–800 cm−1 of the IR spectrum.
__________
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 1, pp. 43–51, January–February, 2008. 相似文献
13.
The kinetics of fluorescence polarization in intense pulse excitation of solid disordered solutions of bichromophores that
consist of complex molecules of two types between which there can be inductiveresonance transfer of electron-excitation energy
is theoretically investigated. Variants of fluorescence excitation by single pulses and pulse trains are considered. The lifetime
of the fluorescence of a given solution increases with the intensity of the exciting pulses. The possibility of controlling
the duration of fluorescence attenuation for donor molecules incorporated into the bichromophores by the action of luminescence
radiation at the frequency of acceptor-molecule absorption on the solution is demonstrated.
Belarusian State University, 4, F. Skorina Ave., Minsk, 220050, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii
Vol. 65, No. 4, pp. 546–550, July–August, 1998. 相似文献
14.
A device for extracorporal irradiation of blood by UV light with λ=300–400 nm is described. A disposable blood flow system
with a specially profiled polymer cuvette is proposed. Mixing of blood during irradiation ensures uniform irradiation of blood
cells passing through the cuvette, which makes it possible to enhance the healing effect of the procedure.
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 2, pp. 289–292, March–April, 1999. 相似文献
15.
V. N. Knyukshto A. M. Shul’ga E. I. Sagun É. I. Zen’kevich 《Journal of Applied Spectroscopy》1998,65(6):943-951
It is established experimentally for the first time that Zn-octaethylporphyrin in a solution of dried methyl cyclohexane is
in unliganded form in the temperature interval of 293-77 K. This form is characterized by the shortest-wave position of absorption
and luminescence spectra, the independence of the degrees of fluorescence and phosphorescence polarizations from the excitation
wavelength, and high phosphorescence time (τT=126 μsec) and quantum yield (φp=0.085) at 77 K. Adding electrodonor components to the methyl cyclohexane or going over to
alcohol-containing polar media leads to the formation of a monoliganded form of ZnOEP, for which we observe a bathochromic
shift of ≈150–350 cm−1 for Q(0,0) absorption and luminescence bands, a splitting of ≈50–100 cm−2 for the Q(0, 0) absorption band, and phosphorescence quenching (τT=60 μsec, φp=0.05-0.03 at 77 K). The effects revealed are explained by a decrease in the symmetry of a ZnOEP molecule in extra
liganding and by an increase in the probability of nonradiative activation for a T1-state due to the extra ligand being involved in the exchange of electron-excitation energy and to the enhancement of a spin-orbital
coupling as a result of the disturbance of the planarity, of a macrocycle.
Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 6, pp. 900–907, November–December, 1998. 相似文献
16.
V. N. Il'in 《Journal of Applied Spectroscopy》1999,66(6):971-975
An interference method for controlling the refractive index of liquids pumped through a capillary is considered. The liquid
is sounded by two systems of interference bands, the period of which differs by an insignificant value prescribed by the condition
of nonius coincidence. An analytical expression is obtained to calculate the refractive index of the liquid controlled in
automatic reading of the interference patterns.
Institute of Electronics, National Academy of Sciences of Belarus, 22 Logoiskii Trakt, Minsk, 220841, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 6, pp. 832–835, November–December, 1999. 相似文献
17.
Regression relations between the first main component, slope of the SBC curve towards the wavelength axis, and the degree
of mineralization of peat soils are established from experimental data. Errors in determination of peat soil productivity
are estimated using different spectral indices. For practical use it is recommended to measure the spectral brightness coefficients
of peat soils in the 0.50–0.75 μm range.
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 1, pp. 102–106, January–February, 1998. 相似文献
18.
T. F. Raichenok 《Journal of Applied Spectroscopy》1999,66(3):470-472
An investigation is made of the absorption, fluorescence, and fluorescence excitation spectra of human blood serum whole and
diluted with a sodium-phosphate buffer solution. Time characteristics of the longwave serum luminescence are obtained. The
quantum yield of background fluorescence upon excitation by radiation with λexc=500 is found to be 0.5%.
Institute of Molecular and Atomic Physics of the National Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072,
Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 3, pp. 433–436, May–June, 1999. 相似文献
19.
A. K. Vershina V. A. Ageev S. D. Izotova B. L. Figurin 《Journal of Applied Spectroscopy》1997,64(3):387-398
The color parameters of carbon coatings deposited by magnetron sputtering of a graphite target onto substrates of stainless
steel without a sublayer and with a titanium sublayer are calculated. By numerical modeling, the refractive indices and extinction
coefficients for the titanium sublayer and carboniferous film as well as the volume content of titanium dioxide in the sublayer
are determined.
Physico-Technical Institute of the Academy of Sciences of Belarus, 4, Zhodinskaya St., Minsk, 220141, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 3, pp. 374–385, May–June, 1997. 相似文献
20.
Introduction of methyl groups in orthopositions of phenyl rings of a Cu-meso-tetraphenylporphin (Cu-TPhP) molecule is shown
to lead to a substantial decrease in the diffusivity of the spectrum of low-temperature (77 K) phosphorescence. It is found
that the long-lived (580 μsec) and short-lived (0.7 μsec) components of Cu-TPhP phosphorescence differ in emission and absorption
(phosphorescence-excitation) spectra and belong to two forms of molecules. The phosphorescence spectrum of the predominant
form with small τp is diffuse, while its absorption spectrum is shifted slightly in a bathochromic manner. The phosphorescence spectrum with
large τp is structural and is similar to the spectrum of Cu-meso-tetrakis-(ortho-tolyl)porphin. The difference is attributed to the
nonplanarity (saddle distortion) of a Cu-TPhP molecule in the lower triplet state in the case of the form with small τp.
Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 F. Skorina Ave., Minsk, 220072, Belarus;
e-mail: llum@imaph.bas-net.by. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 6, pp. 743–747, November–December,
1999. 相似文献